GOG.com now offers the first couple of Worlds of Ultima games gratis on their DRM-free marketplace, saying the free editions of the Ultima spin-offs are being provided courtesy them and Electronic Arts. The games are Worlds of Ultima: The Savage Empire and Ultima: Worlds of Adventure 2: Martian Dreams, and here's word on the sub-series: "Lord British presents two adventures you would never think are possible in Ultima universe. Players of the Ultima series may recall that the black moonstone the Avatar found at the start of Ultima 6 can be used to teleport you anyplace and anytime. That is why ORIGIN Systems have, using the Ultima 6 engine, sent the gamers worldwide on two unexpected journeys in both space and time."

Neither game has really anything to do with Ultima other than cheap name placements, and their quality is Worlds Below the actual Ultima games.

Yes, both games combined are shorter than Ultima 6, whose engine they were based on. Nevertheless, they are good games, especially Martian Dreams... and well worth the price. While Lord British may be absent, look for Warren Spector in both.